bti.c

   1 /*
   2  * Copyright (C) 2008 Greg Kroah-Hartman <greg@kroah.com>
   3  * Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stddef.h>
  22 #include <string.h>
  23 #include <getopt.h>
  24 #include <errno.h>
  25 #include <ctype.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include <time.h>
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <sys/wait.h>
  32 #include <curl/curl.h>
  33 #include <readline/readline.h>
  34 #include <libxml/xmlmemory.h>
  35 #include <libxml/parser.h>
  36 #include <libxml/tree.h>
  37 #include <pcre.h>
  38 #include "bti_version.h"
  39
  40
  41 #define zalloc(size)    calloc(size, 1)
  42
  43 #define dbg(format, arg...)                                             \
  44         do {                                                            \
  45                 if (debug)                                              \
  46                         printf("%s: " format , __func__ , ## arg);      \
  47         } while (0)
  48
  49
  50 static int debug;
  51
  52 enum host {
  53         HOST_TWITTER = 0,
  54         HOST_IDENTICA = 1,
  55 };
  56
  57 enum action {
  58         ACTION_UPDATE = 0,
  59         ACTION_FRIENDS = 1,
  60         ACTION_USER = 2,
  61         ACTION_REPLIES = 4,
  62         ACTION_PUBLIC = 8,
  63         ACTION_UNKNOWN = 16
  64 };
  65
  66 struct session {
  67         char *password;
  68         char *account;
  69         char *tweet;
  70         char *proxy;
  71         char *time;
  72         char *homedir;
  73         char *logfile;
  74         char *user;
  75         int bash;
  76         int shrink_urls;
  77         int dry_run;
  78         int page;
  79         enum host host;
  80         enum action action;
  81 };
  82
  83 struct bti_curl_buffer {
  84         char *data;
  85         enum action action;
  86         int length;
  87 };
  88
  89 static void display_help(void)
  90 {
  91         fprintf(stdout, "bti - send tweet to twitter or identi.ca\n");
  92         fprintf(stdout, "Version: " BTI_VERSION "\n");
  93         fprintf(stdout, "Usage:\n");
  94         fprintf(stdout, "  bti [options]\n");
  95         fprintf(stdout, "options are:\n");
  96         fprintf(stdout, "  --account accountname\n");
  97         fprintf(stdout, "  --password password\n");
  98         fprintf(stdout, "  --action action\n");
  99         fprintf(stdout, "    ('update', 'friends', 'public', 'replies' "
 100                 "or 'user')\n");
 101         fprintf(stdout, "  --user screenname\n");
 102         fprintf(stdout, "  --proxy PROXY:PORT\n");
 103         fprintf(stdout, "  --host HOST\n");
 104         fprintf(stdout, "  --logfile logfile\n");
 105         fprintf(stdout, "  --shrink-urls\n");
 106         fprintf(stdout, "  --bash\n");
 107         fprintf(stdout, "  --debug\n");
 108         fprintf(stdout, "  --version\n");
 109         fprintf(stdout, "  --help\n");
 110 }
 111
 112 static void display_version(void)
 113 {
 114         fprintf(stdout, "bti - version %s\n", BTI_VERSION);
 115 }
 116
 117 static struct session *session_alloc(void)
 118 {
 119         struct session *session;
 120
 121         session = zalloc(sizeof(*session));
 122         if (!session)
 123                 return NULL;
 124         return session;
 125 }
 126
 127 static void session_free(struct session *session)
 128 {
 129         if (!session)
 130                 return;
 131         free(session->password);
 132         free(session->account);
 133         free(session->tweet);
 134         free(session->proxy);
 135         free(session->time);
 136         free(session->homedir);
 137         free(session->user);
 138         free(session);
 139 }
 140
 141 static struct bti_curl_buffer *bti_curl_buffer_alloc(enum action action)
 142 {
 143         struct bti_curl_buffer *buffer;
 144
 145         buffer = zalloc(sizeof(*buffer));
 146         if (!buffer)
 147                 return NULL;
 148
 149         /* start out with a data buffer of 1 byte to
 150          * make the buffer fill logic simpler */
 151         buffer->data = zalloc(1);
 152         if (!buffer->data) {
 153                 free(buffer);
 154                 return NULL;
 155         }
 156         buffer->length = 0;
 157         buffer->action = action;
 158         return buffer;
 159 }
 160
 161 static void bti_curl_buffer_free(struct bti_curl_buffer *buffer)
 162 {
 163         if (!buffer)
 164                 return;
 165         free(buffer->data);
 166         free(buffer);
 167 }
 168
 169 static const char *twitter_user_url    = "http://twitter.com/statuses/user_timeline/";
 170 static const char *twitter_update_url  = "https://twitter.com/statuses/update.xml";
 171 static const char *twitter_public_url  = "http://twitter.com/statuses/public_timeline.xml";
 172 static const char *twitter_friends_url = "https://twitter.com/statuses/friends_timeline.xml";
 173 static const char *twitter_replies_url = "http://twitter.com/statuses/replies.xml";
 174
 175 static const char *identica_user_url    = "http://identi.ca/api/statuses/user_timeline/";
 176 static const char *identica_update_url  = "http://identi.ca/api/statuses/update.xml";
 177 static const char *identica_public_url  = "http://identi.ca/api/statuses/public_timeline.xml";
 178 static const char *identica_friends_url = "http://identi.ca/api/statuses/friends_timeline.xml";
 179 static const char *identica_replies_url = "http://identi.ca/api/statuses/replies.xml";
 180
 181 static CURL *curl_init(void)
 182 {
 183         CURL *curl;
 184
 185         curl = curl_easy_init();
 186         if (!curl) {
 187                 fprintf(stderr, "Can not init CURL!\n");
 188                 return NULL;
 189         }
 190         /* some ssl sanity checks on the connection we are making */
 191         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 192         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0);
 193         return curl;
 194 }
 195
 196 void parse_statuses(xmlDocPtr doc, xmlNodePtr current)
 197 {
 198         xmlChar *text = NULL;
 199         xmlChar *user = NULL;
 200         xmlNodePtr userinfo;
 201
 202         current = current->xmlChildrenNode;
 203         while (current != NULL) {
 204                 if (current->type == XML_ELEMENT_NODE) {
 205                         if (!xmlStrcmp(current->name, (const xmlChar *)"text"))
 206                                 text = xmlNodeListGetString(doc, current->xmlChildrenNode, 1);
 207                         if (!xmlStrcmp(current->name, (const xmlChar *)"user")) {
 208                                 userinfo = current->xmlChildrenNode;
 209                                 while (userinfo != NULL) {
 210                                         if ((!xmlStrcmp(userinfo->name, (const xmlChar *)"screen_name"))) {
 211                                                 if (user)
 212                                                         xmlFree(user);
 213                                                 user = xmlNodeListGetString(doc, userinfo->xmlChildrenNode, 1);
 214                                         }
 215                                         userinfo = userinfo->next;
 216                                 }
 217                         }
 218                         if (user && text) {
 219                                 printf("[%s] %s\n", user, text);
 220                                 xmlFree(user);
 221                                 xmlFree(text);
 222                                 user = NULL;
 223                                 text = NULL;
 224                         }
 225                 }
 226                 current = current->next;
 227         }
 228
 229         return;
 230 }
 231
 232 static void parse_timeline(char *document)
 233 {
 234         xmlDocPtr doc;
 235         xmlNodePtr current;
 236
 237         doc = xmlReadMemory(document, strlen(document), "timeline.xml",
 238                             NULL, XML_PARSE_NOERROR);
 239         if (doc == NULL)
 240                 return;
 241
 242         current = xmlDocGetRootElement(doc);
 243         if (current == NULL) {
 244                 fprintf(stderr, "empty document\n");
 245                 xmlFreeDoc(doc);
 246                 return;
 247         }
 248
 249         if (xmlStrcmp(current->name, (const xmlChar *) "statuses")) {
 250                 fprintf(stderr, "unexpected document type\n");
 251                 xmlFreeDoc(doc);
 252                 return;
 253         }
 254
 255         current = current->xmlChildrenNode;
 256         while (current != NULL) {
 257                 if ((!xmlStrcmp(current->name, (const xmlChar *)"status")))
 258                         parse_statuses(doc, current);
 259                 current = current->next;
 260         }
 261         xmlFreeDoc(doc);
 262
 263         return;
 264 }
 265
 266 size_t curl_callback(void *buffer, size_t size, size_t nmemb, void *userp)
 267 {
 268         struct bti_curl_buffer *curl_buf = userp;
 269         size_t buffer_size = size * nmemb;
 270         char *temp;
 271
 272         if ((!buffer) || (!buffer_size) || (!curl_buf))
 273                 return -EINVAL;
 274
 275         /* add to the data we already have */
 276         temp = zalloc(curl_buf->length + buffer_size + 1);
 277         if (!temp)
 278                 return -ENOMEM;
 279
 280         memcpy(temp, curl_buf->data, curl_buf->length);
 281         free(curl_buf->data);
 282         curl_buf->data = temp;
 283         memcpy(&curl_buf->data[curl_buf->length], (char *)buffer, buffer_size);
 284         curl_buf->length += buffer_size;
 285         if (curl_buf->action)
 286                 parse_timeline(curl_buf->data);
 287
 288         dbg("%s\n", curl_buf->data);
 289
 290         return buffer_size;
 291 }
 292
 293 static int send_request(struct session *session)
 294 {
 295         char user_password[500];
 296         char data[500];
 297         /* is there usernames longer than 22 chars? */
 298         char user_url[70];
 299         struct bti_curl_buffer *curl_buf;
 300         CURL *curl = NULL;
 301         CURLcode res;
 302         struct curl_httppost *formpost = NULL;
 303         struct curl_httppost *lastptr = NULL;
 304         struct curl_slist *slist = NULL;
 305
 306         if (!session)
 307                 return -EINVAL;
 308
 309         curl_buf = bti_curl_buffer_alloc(session->action);
 310         if (!curl_buf)
 311                 return -ENOMEM;
 312
 313         curl = curl_init();
 314         if (!curl)
 315                 return -EINVAL;
 316
 317         switch (session->action) {
 318         case ACTION_UPDATE:
 319                 snprintf(user_password, sizeof(user_password), "%s:%s",
 320                          session->account, session->password);
 321                 snprintf(data, sizeof(data), "status=\"%s\"", session->tweet);
 322                 curl_formadd(&formpost, &lastptr,
 323                              CURLFORM_COPYNAME, "status",
 324                              CURLFORM_COPYCONTENTS, session->tweet,
 325                              CURLFORM_END);
 326
 327                 curl_formadd(&formpost, &lastptr,
 328                              CURLFORM_COPYNAME, "source",
 329                              CURLFORM_COPYCONTENTS, "bti",
 330                              CURLFORM_END);
 331
 332                 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
 333                 slist = curl_slist_append(slist, "Expect:");
 334                 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist);
 335                 switch (session->host) {
 336                 case HOST_TWITTER:
 337                         curl_easy_setopt(curl, CURLOPT_URL,
 338                                          twitter_update_url);
 339                         break;
 340                 case HOST_IDENTICA:
 341                         curl_easy_setopt(curl, CURLOPT_URL,
 342                                          identica_update_url);
 343                         break;
 344                 }
 345                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 346
 347                 break;
 348         case ACTION_FRIENDS:
 349                 snprintf(user_password, sizeof(user_password), "%s:%s",
 350                          session->account, session->password);
 351                 switch (session->host) {
 352                 case HOST_TWITTER:
 353                         sprintf(user_url, "%s?page=%d", twitter_friends_url, session->page);
 354                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 355                         break;
 356                 case HOST_IDENTICA:
 357                         sprintf(user_url, "%s?page=%d", identica_friends_url, session->page);
 358                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 359                         break;
 360                 }
 361                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 362
 363                 break;
 364         case ACTION_USER:
 365                 switch (session->host) {
 366                 case HOST_TWITTER:
 367                         sprintf(user_url, "%s%s.xml?page=%d", twitter_user_url, session->user, session->page);
 368                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 369                         break;
 370                 case HOST_IDENTICA:
 371                         sprintf(user_url, "%s%s.xml?page=%d", identica_user_url, session->user, session->page);
 372                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 373                         break;
 374                 }
 375
 376                 break;
 377         case ACTION_REPLIES:
 378                 snprintf(user_password, sizeof(user_password), "%s:%s",
 379                          session->account, session->password);
 380                 switch (session->host) {
 381                 case HOST_TWITTER:
 382                         sprintf(user_url, "%s?page=%d", twitter_replies_url, session->page);
 383                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 384                         break;
 385                 case HOST_IDENTICA:
 386                         sprintf(user_url, "%s?page=%d", identica_replies_url, session->page);
 387                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 388                         break;
 389                 }
 390                 curl_easy_setopt(curl, CURLOPT_USERPWD, user_password);
 391
 392                 break;
 393         case ACTION_PUBLIC:
 394                 switch (session->host) {
 395                 case HOST_TWITTER:
 396                         sprintf(user_url, "%s?page=%d", twitter_public_url, session->page);
 397                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 398                         break;
 399                 case HOST_IDENTICA:
 400                         sprintf(user_url, "%s?page=%d", identica_public_url, session->page);
 401                         curl_easy_setopt(curl, CURLOPT_URL, user_url);
 402                         break;
 403                 }
 404
 405                 break;
 406         default:
 407                 break;
 408         }
 409
 410         if (session->proxy)
 411                 curl_easy_setopt(curl, CURLOPT_PROXY, session->proxy);
 412
 413         if (debug)
 414                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
 415
 416         dbg("user_password = %s\n", user_password);
 417         dbg("data = %s\n", data);
 418         dbg("proxy = %s\n", session->proxy);
 419
 420         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_callback);
 421         curl_easy_setopt(curl, CURLOPT_WRITEDATA, curl_buf);
 422         if (!session->dry_run) {
 423                 res = curl_easy_perform(curl);
 424                 if (res && !session->bash) {
 425                         fprintf(stderr, "error(%d) trying to perform "
 426                                 "operation\n", res);
 427                         return -EINVAL;
 428                 }
 429         }
 430
 431         curl_easy_cleanup(curl);
 432         if (session->action == ACTION_UPDATE)
 433                 curl_formfree(formpost);
 434         bti_curl_buffer_free(curl_buf);
 435         return 0;
 436 }
 437
 438 static void parse_configfile(struct session *session)
 439 {
 440         FILE *config_file;
 441         char *line = NULL;
 442         size_t len = 0;
 443         char *account = NULL;
 444         char *password = NULL;
 445         char *host = NULL;
 446         char *proxy = NULL;
 447         char *logfile = NULL;
 448         char *action = NULL;
 449         char *user = NULL;
 450         char *file;
 451         int shrink_urls = 0;
 452
 453         /* config file is ~/.bti  */
 454         file = alloca(strlen(session->homedir) + 7);
 455
 456         sprintf(file, "%s/.bti", session->homedir);
 457
 458         config_file = fopen(file, "r");
 459
 460         /* No error if file does not exist or is unreadable.  */
 461         if (config_file == NULL)
 462                 return;
 463
 464         do {
 465                 ssize_t n = getline(&line, &len, config_file);
 466                 if (n < 0)
 467                         break;
 468                 if (line[n - 1] == '\n')
 469                         line[n - 1] = '\0';
 470                 /* Parse file.  Format is the usual value pairs:
 471                    account=name
 472                    passwort=value
 473                    # is a comment character
 474                 */
 475                 *strchrnul(line, '#') = '\0';
 476                 char *c = line;
 477                 while (isspace(*c))
 478                         c++;
 479                 /* Ignore blank lines.  */
 480                 if (c[0] == '\0')
 481                         continue;
 482
 483                 if (!strncasecmp(c, "account", 7) && (c[7] == '=')) {
 484                         c += 8;
 485                         if (c[0] != '\0')
 486                                 account = strdup(c);
 487                 } else if (!strncasecmp(c, "password", 8) &&
 488                            (c[8] == '=')) {
 489                         c += 9;
 490                         if (c[0] != '\0')
 491                                 password = strdup(c);
 492                 } else if (!strncasecmp(c, "host", 4) &&
 493                            (c[4] == '=')) {
 494                         c += 5;
 495                         if (c[0] != '\0')
 496                                 host = strdup(c);
 497                 } else if (!strncasecmp(c, "proxy", 5) &&
 498                            (c[5] == '=')) {
 499                         c += 6;
 500                         if (c[0] != '\0')
 501                                 proxy = strdup(c);
 502                 } else if (!strncasecmp(c, "logfile", 7) &&
 503                            (c[7] == '=')) {
 504                         c += 8;
 505                         if (c[0] != '\0')
 506                                 logfile = strdup(c);
 507                 } else if (!strncasecmp(c, "action", 6) &&
 508                            (c[6] == '=')) {
 509                         c += 7;
 510                         if (c[0] != '\0')
 511                                 action = strdup(c);
 512                 } else if (!strncasecmp(c, "user", 4) &&
 513                                 (c[4] == '=')) {
 514                         c += 5;
 515                         if (c[0] != '\0')
 516                                 user = strdup(c);
 517                 } else if (!strncasecmp(c, "shrink-urls", 11) &&
 518                                 (c[11] == '=')) {
 519                         c += 12;
 520                         if (!strncasecmp(c, "true", 4) ||
 521                                         !strncasecmp(c, "yes", 3))
 522                                 shrink_urls = 1;
 523                 }
 524         } while (!feof(config_file));
 525
 526         if (password)
 527                 session->password = password;
 528         if (account)
 529                 session->account = account;
 530         if (host) {
 531                 if (strcasecmp(host, "twitter") == 0)
 532                         session->host = HOST_TWITTER;
 533                 if (strcasecmp(host, "identica") == 0)
 534                         session->host = HOST_IDENTICA;
 535                 free(host);
 536         }
 537         if (proxy) {
 538                 if (session->proxy)
 539                         free(session->proxy);
 540                 session->proxy = proxy;
 541         }
 542         if (logfile)
 543                 session->logfile = logfile;
 544         if (action) {
 545                 if (strcasecmp(action, "update") == 0)
 546                         session->action = ACTION_UPDATE;
 547                 else if (strcasecmp(action, "friends") == 0)
 548                         session->action = ACTION_FRIENDS;
 549                 else if (strcasecmp(action, "user") == 0)
 550                         session->action = ACTION_USER;
 551                 else if (strcasecmp(action, "replies") == 0)
 552                         session->action = ACTION_REPLIES;
 553                 else if (strcasecmp(action, "public") == 0)
 554                         session->action = ACTION_PUBLIC;
 555                 else
 556                         session->action = ACTION_UNKNOWN;
 557                 free(action);
 558         }
 559         if (user)
 560                 session->user = user;
 561         session->shrink_urls = shrink_urls;
 562
 563         /* Free buffer and close file.  */
 564         free(line);
 565         fclose(config_file);
 566 }
 567
 568 static void log_session(struct session *session, int retval)
 569 {
 570         FILE *log_file;
 571         char *filename;
 572         char *host;
 573
 574         /* Only log something if we have a log file set */
 575         if (!session->logfile)
 576                 return;
 577
 578         filename = alloca(strlen(session->homedir) +
 579                           strlen(session->logfile) + 3);
 580
 581         sprintf(filename, "%s/%s", session->homedir, session->logfile);
 582
 583         log_file = fopen(filename, "a+");
 584         if (log_file == NULL)
 585                 return;
 586         switch (session->host) {
 587         case HOST_TWITTER:
 588                 host = "twitter";
 589                 break;
 590         case HOST_IDENTICA:
 591                 host = "identi.ca";
 592                 break;
 593         default:
 594                 host = "unknown";
 595                 break;
 596         }
 597
 598         switch (session->action) {
 599         case ACTION_UPDATE:
 600                 if (retval)
 601                         fprintf(log_file, "%s: host=%s tweet failed\n",
 602                                 session->time, host);
 603                 else
 604                         fprintf(log_file, "%s: host=%s tweet=%s\n",
 605                                 session->time, host, session->tweet);
 606                 break;
 607         case ACTION_FRIENDS:
 608                 fprintf(log_file, "%s: host=%s retrieving friends timeline\n",
 609                         session->time, host);
 610                 break;
 611         case ACTION_USER:
 612                 fprintf(log_file, "%s: host=%s retrieving %s's timeline\n",
 613                         session->time, host, session->user);
 614                 break;
 615         case ACTION_REPLIES:
 616                 fprintf(log_file, "%s: host=%s retrieving replies\n",
 617                         session->time, host);
 618                 break;
 619         case ACTION_PUBLIC:
 620                 fprintf(log_file, "%s: host=%s retrieving public timeline\n",
 621                         session->time, host);
 622                 break;
 623         default:
 624                 break;
 625         }
 626
 627         fclose(log_file);
 628 }
 629
 630 static char *get_string_from_stdin(void)
 631 {
 632         char *temp;
 633         char *string;
 634
 635         string = zalloc(1000);
 636         if (!string)
 637                 return NULL;
 638
 639         if (!fgets(string, 999, stdin))
 640                 return NULL;
 641         temp = strchr(string, '\n');
 642         *temp = '\0';
 643         return string;
 644 }
 645
 646 static int find_urls(const char *tweet, int **pranges)
 647 {
 648         /*
 649          * magic obtained from
 650          * http://www.geekpedia.com/KB65_How-to-validate-an-URL-using-RegEx-in-Csharp.html
 651          */
 652         static const char *re_magic =
 653                 "(([a-zA-Z][0-9a-zA-Z+\\-\\.]*:)/{1,3}"
 654                 "[0-9a-zA-Z;/~?:@&=+$\\.\\-_'()%]+)"
 655                 "(#[0-9a-zA-Z;/?:@&=+$\\.\\-_!~*'()%]+)?";
 656         pcre *re;
 657         const char *errptr;
 658         int erroffset;
 659         int ovector[10] = {0,};
 660         const size_t ovsize = sizeof(ovector)/sizeof(*ovector);
 661         int startoffset, tweetlen;
 662         int i, rc;
 663         int rbound = 10;
 664         int rcount = 0;
 665         int *ranges = malloc(sizeof(int) * rbound);
 666
 667         re = pcre_compile(re_magic,
 668                         PCRE_NO_AUTO_CAPTURE,
 669                         &errptr, &erroffset, NULL);
 670         if (!re) {
 671                 fprintf(stderr, "pcre_compile @%u: %s\n", erroffset, errptr);
 672                 exit(1);
 673         }
 674
 675         tweetlen = strlen(tweet);
 676         for (startoffset = 0; startoffset < tweetlen; ) {
 677
 678                 rc = pcre_exec(re, NULL, tweet, strlen(tweet), startoffset, 0,
 679                                 ovector, ovsize);
 680                 if (rc == PCRE_ERROR_NOMATCH)
 681                         break;
 682
 683                 if (rc < 0) {
 684                         fprintf(stderr, "pcre_exec @%u: %s\n",
 685                                 erroffset, errptr);
 686                         exit(1);
 687                 }
 688
 689                 for (i = 0; i < rc; i += 2) {
 690                         if ((rcount+2) == rbound) {
 691                                 rbound *= 2;
 692                                 ranges = realloc(ranges, sizeof(int) * rbound);
 693                         }
 694
 695                         ranges[rcount++] = ovector[i];
 696                         ranges[rcount++] = ovector[i+1];
 697                 }
 698
 699                 startoffset = ovector[1];
 700         }
 701
 702         pcre_free(re);
 703
 704         *pranges = ranges;
 705         return rcount;
 706 }
 707
 708 /**
 709  * bidirectional popen() call
 710  *
 711  * @param rwepipe - int array of size three
 712  * @param exe - program to run
 713  * @param argv - argument list
 714  * @return pid or -1 on error
 715  *
 716  * The caller passes in an array of three integers (rwepipe), on successful
 717  * execution it can then write to element 0 (stdin of exe), and read from
 718  * element 1 (stdout) and 2 (stderr).
 719  */
 720 static int popenRWE(int *rwepipe, const char *exe, const char *const argv[])
 721 {
 722         int in[2];
 723         int out[2];
 724         int err[2];
 725         int pid;
 726         int rc;
 727
 728         rc = pipe(in);
 729         if (rc < 0)
 730                 goto error_in;
 731
 732         rc = pipe(out);
 733         if (rc < 0)
 734                 goto error_out;
 735
 736         rc = pipe(err);
 737         if (rc < 0)
 738                 goto error_err;
 739
 740         pid = fork();
 741         if (pid > 0) {
 742                 /* parent */
 743                 close(in[0]);
 744                 close(out[1]);
 745                 close(err[1]);
 746                 rwepipe[0] = in[1];
 747                 rwepipe[1] = out[0];
 748                 rwepipe[2] = err[0];
 749                 return pid;
 750         } else if (pid == 0) {
 751                 /* child */
 752                 close(in[1]);
 753                 close(out[0]);
 754                 close(err[0]);
 755                 close(0);
 756                 rc = dup(in[0]);
 757                 close(1);
 758                 rc = dup(out[1]);
 759                 close(2);
 760                 rc = dup(err[1]);
 761
 762                 execvp(exe, (char **)argv);
 763                 exit(1);
 764         } else
 765                 goto error_fork;
 766
 767         return pid;
 768
 769 error_fork:
 770         close(err[0]);
 771         close(err[1]);
 772 error_err:
 773         close(out[0]);
 774         close(out[1]);
 775 error_out:
 776         close(in[0]);
 777         close(in[1]);
 778 error_in:
 779         return -1;
 780 }
 781
 782 static int pcloseRWE(int pid, int *rwepipe)
 783 {
 784         int rc, status;
 785         close(rwepipe[0]);
 786         close(rwepipe[1]);
 787         close(rwepipe[2]);
 788         rc = waitpid(pid, &status, 0);
 789         return status;
 790 }
 791
 792 static char *shrink_one_url(int *rwepipe, char *big)
 793 {
 794         int biglen = strlen(big);
 795         char *small;
 796         int smalllen;
 797         int rc;
 798
 799         rc = dprintf(rwepipe[0], "%s\n", big);
 800         if (rc < 0)
 801                 return big;
 802
 803         smalllen = biglen + 128;
 804         small = malloc(smalllen);
 805         if (!small)
 806                 return big;
 807
 808         rc = read(rwepipe[1], small, smalllen);
 809         if (rc < 0 || rc > biglen)
 810                 goto error_free_small;
 811
 812         if (strncmp(small, "http://", 7))
 813                 goto error_free_small;
 814
 815         smalllen = rc;
 816         while (smalllen && isspace(small[smalllen-1]))
 817                         small[--smalllen] = 0;
 818
 819         free(big);
 820         return small;
 821
 822 error_free_small:
 823         free(small);
 824         return big;
 825 }
 826
 827 static char *shrink_urls(char *text)
 828 {
 829         int *ranges;
 830         int rcount;
 831         int i;
 832         int inofs = 0;
 833         int outofs = 0;
 834         const char *const shrink_args[] = {
 835                 "bti-shrink-urls",
 836                 NULL
 837         };
 838         int shrink_pid;
 839         int shrink_pipe[3];
 840         int inlen = strlen(text);
 841
 842         dbg("before len=%u\n", inlen);
 843
 844         shrink_pid = popenRWE(shrink_pipe, shrink_args[0], shrink_args);
 845         if (shrink_pid < 0)
 846                 return text;
 847
 848         rcount = find_urls(text, &ranges);
 849         if (!rcount)
 850                 return text;
 851
 852         for (i = 0; i < rcount; i += 2) {
 853                 int url_start = ranges[i];
 854                 int url_end = ranges[i+1];
 855                 int long_url_len = url_end - url_start;
 856                 char *url = strndup(text + url_start, long_url_len);
 857                 int short_url_len;
 858                 int not_url_len = url_start - inofs;
 859
 860                 dbg("long  url[%u]: %s\n", long_url_len, url);
 861                 url = shrink_one_url(shrink_pipe, url);
 862                 short_url_len = url ? strlen(url) : 0;
 863                 dbg("short url[%u]: %s\n", short_url_len, url);
 864
 865                 if (!url || short_url_len >= long_url_len) {
 866                         /* The short url ended up being too long
 867                          * or unavailable */
 868                         if (inofs) {
 869                                 strncpy(text + outofs, text + inofs,
 870                                                 not_url_len + long_url_len);
 871                         }
 872                         inofs += not_url_len + long_url_len;
 873                         outofs += not_url_len + long_url_len;
 874
 875                 } else {
 876                         /* copy the unmodified block */
 877                         strncpy(text + outofs, text + inofs, not_url_len);
 878                         inofs += not_url_len;
 879                         outofs += not_url_len;
 880
 881                         /* copy the new url */
 882                         strncpy(text + outofs, url, short_url_len);
 883                         inofs += long_url_len;
 884                         outofs += short_url_len;
 885                 }
 886
 887                 free(url);
 888         }
 889
 890         /* copy the last block after the last match */
 891         if (inofs) {
 892                 int tail = inlen - inofs;
 893                 if (tail) {
 894                         strncpy(text + outofs, text + inofs, tail);
 895                         outofs += tail;
 896                 }
 897         }
 898
 899         free(ranges);
 900
 901         (void)pcloseRWE(shrink_pid, shrink_pipe);
 902
 903         text[outofs] = 0;
 904         dbg("after len=%u\n", outofs);
 905         return text;
 906 }
 907
 908 int main(int argc, char *argv[], char *envp[])
 909 {
 910         static const struct option options[] = {
 911                 { "debug", 0, NULL, 'd' },
 912                 { "account", 1, NULL, 'a' },
 913                 { "password", 1, NULL, 'p' },
 914                 { "host", 1, NULL, 'H' },
 915                 { "proxy", 1, NULL, 'P' },
 916                 { "action", 1, NULL, 'A' },
 917                 { "user", 1, NULL, 'u' },
 918                 { "logfile", 1, NULL, 'L' },
 919                 { "shrink-urls", 0, NULL, 's' },
 920                 { "help", 0, NULL, 'h' },
 921                 { "bash", 0, NULL, 'b' },
 922                 { "dry-run", 0, NULL, 'n' },
 923                 { "page", 1, NULL, 'g' },
 924                 { "version", 0, NULL, 'v' },
 925                 { }
 926         };
 927         struct session *session;
 928         pid_t child;
 929         char *tweet;
 930         int retval = 0;
 931         int option;
 932         char *http_proxy;
 933         time_t t;
 934         int page_nr;
 935
 936         debug = 0;
 937         rl_bind_key('\t', rl_insert);
 938
 939         session = session_alloc();
 940         if (!session) {
 941                 fprintf(stderr, "no more memory...\n");
 942                 return -1;
 943         }
 944
 945         /* get the current time so that we can log it later */
 946         time(&t);
 947         session->time = strdup(ctime(&t));
 948         session->time[strlen(session->time)-1] = 0x00;
 949
 950         session->homedir = strdup(getenv("HOME"));
 951
 952         curl_global_init(CURL_GLOBAL_ALL);
 953
 954         /* Set environment variables first, before reading command line options
 955          * or config file values. */
 956         http_proxy = getenv("http_proxy");
 957         if (http_proxy) {
 958                 if (session->proxy)
 959                         free(session->proxy);
 960                 session->proxy = strdup(http_proxy);
 961                 dbg("http_proxy = %s\n", session->proxy);
 962         }
 963
 964         parse_configfile(session);
 965
 966         while (1) {
 967                 option = getopt_long_only(argc, argv, "dqe:p:P:H:a:A:u:hg:",
 968                                           options, NULL);
 969                 if (option == -1)
 970                         break;
 971                 switch (option) {
 972                 case 'd':
 973                         debug = 1;
 974                         break;
 975                 case 'a':
 976                         if (session->account)
 977                                 free(session->account);
 978                         session->account = strdup(optarg);
 979                         dbg("account = %s\n", session->account);
 980                         break;
 981                 case 'g':
 982                         page_nr = atoi(optarg);
 983                         dbg("page = %d\n", page_nr);
 984                         session->page = page_nr;
 985                         break;
 986                 case 'p':
 987                         if (session->password)
 988                                 free(session->password);
 989                         session->password = strdup(optarg);
 990                         dbg("password = %s\n", session->password);
 991                         break;
 992                 case 'P':
 993                         if (session->proxy)
 994                                 free(session->proxy);
 995                         session->proxy = strdup(optarg);
 996                         dbg("proxy = %s\n", session->proxy);
 997                         break;
 998                 case 'A':
 999                         if (strcasecmp(optarg, "update") == 0)
1000                                 session->action = ACTION_UPDATE;
1001                         else if (strcasecmp(optarg, "friends") == 0)
1002                                 session->action = ACTION_FRIENDS;
1003                         else if (strcasecmp(optarg, "user") == 0)
1004                                 session->action = ACTION_USER;
1005                         else if (strcasecmp(optarg, "replies") == 0)
1006                                 session->action = ACTION_REPLIES;
1007                         else if (strcasecmp(optarg, "public") == 0)
1008                                 session->action = ACTION_PUBLIC;
1009                         else
1010                                 session->action = ACTION_UNKNOWN;
1011                         dbg("action = %d\n", session->action);
1012                         break;
1013                 case 'u':
1014                         if (session->user)
1015                                 free(session->user);
1016                         session->user = strdup(optarg);
1017                         dbg("user = %s\n", session->user);
1018                         break;
1019                 case 'L':
1020                         if (session->logfile)
1021                                 free(session->logfile);
1022                         session->logfile = strdup(optarg);
1023                         dbg("logfile = %s\n", session->logfile);
1024                         break;
1025                 case 's':
1026                         session->shrink_urls = 1;
1027                         break;
1028                 case 'H':
1029                         if (strcasecmp(optarg, "twitter") == 0)
1030                                 session->host = HOST_TWITTER;
1031                         if (strcasecmp(optarg, "identica") == 0)
1032                                 session->host = HOST_IDENTICA;
1033                         dbg("host = %d\n", session->host);
1034                         break;
1035                 case 'b':
1036                         session->bash = 1;
1037                         break;
1038                 case 'h':
1039                         display_help();
1040                         goto exit;
1041                 case 'n':
1042                         session->dry_run = 1;
1043                         break;
1044                 case 'v':
1045                         display_version();
1046                         goto exit;
1047                 default:
1048                         display_help();
1049                         goto exit;
1050                 }
1051         }
1052
1053         if (session->action == ACTION_UNKNOWN) {
1054                 fprintf(stderr, "Unknown action, valid actions are:\n");
1055                 fprintf(stderr, "'update', 'friends', 'public', "
1056                         "'replies' or 'user'.\n");
1057                 goto exit;
1058         }
1059
1060         if (!session->account) {
1061                 fprintf(stdout, "Enter twitter account: ");
1062                 session->account = readline(NULL);
1063         }
1064
1065         if (!session->password) {
1066                 fprintf(stdout, "Enter twitter password: ");
1067                 session->password = readline(NULL);
1068         }
1069
1070         if (session->action == ACTION_UPDATE) {
1071                 if (session->bash)
1072                         tweet = get_string_from_stdin();
1073                 else
1074                         tweet = readline("tweet: ");
1075                 if (!tweet || strlen(tweet) == 0) {
1076                         dbg("no tweet?\n");
1077                         return -1;
1078                 }
1079
1080                 if (session->shrink_urls)
1081                         tweet = shrink_urls(tweet);
1082
1083                 session->tweet = zalloc(strlen(tweet) + 10);
1084                 if (session->bash)
1085                         sprintf(session->tweet, "$ %s", tweet);
1086                 else
1087                         sprintf(session->tweet, "%s", tweet);
1088
1089                 free(tweet);
1090                 dbg("tweet = %s\n", session->tweet);
1091         }
1092
1093         if (!session->user)
1094                 session->user = strdup(session->account);
1095
1096         if (session->page == 0)
1097                 session->page = 1;
1098         dbg("account = %s\n", session->account);
1099         dbg("password = %s\n", session->password);
1100         dbg("host = %d\n", session->host);
1101         dbg("action = %d\n", session->action);
1102
1103         /* fork ourself so that the main shell can get on
1104          * with it's life as we try to connect and handle everything
1105          */
1106         if (session->bash) {
1107                 child = fork();
1108                 if (child) {
1109                         dbg("child is %d\n", child);
1110                         exit(0);
1111                 }
1112         }
1113
1114         retval = send_request(session);
1115         if (retval && !session->bash)
1116                 fprintf(stderr, "operation failed\n");
1117
1118         log_session(session, retval);
1119 exit:
1120         session_free(session);
1121         return retval;;
1122 }